Loading dive centres and instructors…
Loading dive centres and instructors…
Normoxic Decompression in worldwide: 5 dive centres on TecDiveTools, with agencies, courses taught and a summary of what students say. 2 publish course prices.
TecDiveTools lists 5 dive centres teaching Normoxic Decompression worldwide. 2 of them publish course prices, in the currency the shop advertises and with the date each was checked — not converted, and not estimated.
Listings are ordered by how much evidence exists about their technical diving, not by a star rating, with any paid Featured listing shown first and marked as such (how rankings work). 4 of these 5 carry reviews we have read and classified as being about technical or overhead training. The count excludes recreational certifications by name, so a busy resort does not outrank a one-instructor cave operation on the volume of its reef trips. Separately, 4 have at least one instructor whose reviews we have read and summarised — a dive centre carries no synthesis of its own. How we read and count reviews.
Looking for individual instructors instead? Instructors.
About the course
Normoxic Decompression teaches staged decompression diving on normoxic trimix (a breathable-at-surface gas blend with at least 18% oxygen), reducing nitrogen narcosis while maintaining adequate oxygen for decompression stops. This intermediate technical course for experienced RAID divers covers normoxic trimix gas physics and blending, narcosis reduction through gas selection, multi-stage decompression procedures, equipment configuration for sidemount or twinset systems, bailout protocols, and problem-solving at moderate technical depths. Maximum depth is 60 meters (200 feet). Graduates can safely execute complex open-water technical dives and explore deeper wreck interiors and cave systems.
Manage detailed gas needs for exploration and decompression, execute multi-stage decompression dives to 60 metres with proper oxygen management, control END (Equivalent Narcotic Depth), balance precision with variable adjustments, and solve problems at technical depths.
5 dive centres on TecDiveTools teach RAID Normoxic Decompression worldwide: Thailand (3), Indonesia (1) and Philippines (1). Each is listed above.
One centre in the TecDiveTools directory publishes a whole-course price for RAID Normoxic Decompression worldwide: Tech Dive Asia, at THB 59,900. Prices differ mainly in what they include, so compare the inclusions before comparing the numbers. Prices were last checked in September 2026.
5 days, based on the durations 1 centre publishes for it worldwide. The time depends on the centre's schedule, weather, and how quickly the required skills are demonstrated — agencies set a minimum number of dives, not a fixed number of days.
At the same tier in TecDiveTools' cross-agency comparison, dive centres worldwide also teach TDI Trimix (108), IANTD Normoxic Trimix Diver (24), PADI TecRec Tec Trimix 65 (3), SSI XR Technical Extended Range Trimix (1) and PSAI Trimix Fundamentals (1). They are comparable rather than interchangeable — each agency sets its own standards and card, so check which one your next course accepts.